The topological dimension of radial Julia sets

We prove that the meandering set for $f_a(z)=e^z+a$ is homeomorphic to the space of irrational numbers whenever $a$ belongs to the Fatou set of $f_a$. This extends recent results by Vasiliki Evdoridou and Lasse Rempe. It implies that the radial Julia set of $f_a$ has topological dimension zero for all attracting and parabolic parameters, including all $a\in (-\mathrm{\infty },-1]$. Similar results are obtained for Fatou’s function $f(z)=z+1+e^{-z}$.